PD72042B_15 Datasheet, PDF (55/92 Pages) Renesas Technology Corp – LSI DEVICE FOR Inter Equipment BusTM (IEBusTM) PROTOCOL CONTROL

µPD72042B
Table 4-9 indicates the SLRC return code issued in broadcast reception when an optional function is set in the
CMR register with DERC = 1.
Table 4-9 SLRC Return Code in Broadcast Reception When the Optional Function Is Set (DERC = 1)
SLRC
1100
Description
1. Meaning: Broadcast reception error
2. Occurrence condition: This return code is issued if RBF is not ready for reception^Note when the
control field is received. In this case, the master address in the communication frame is set as a
broadcast address in DAR2 and DAR1.
3. Microcomputer processing: A broadcast address can be read from DAR1 and DAR2. However, the
data of DAR1 and DAR2 is updated each time a broadcast reception error occurs. So, ensure that data
is read from DAR1 and DAR2 within the interval indicated below.
• Read time: Approx. 5420 µs (mode 0)
Approx. 1490 µs (mode 1)
Note RBF is ready for reception according to the optional function setting in CMR, as described below.
(i) When MFC = 0
The SLRE flag of the FLG register is 1 (slave reception and broadcast reception only); and
RBF is empty.
(ii) When MFC = 1
The SLRE flag of the FLG register is 1 (slave reception and broadcast reception only); and
RBF has at least 4 bytes of free space.
When RBF is ready for reception, bit 1 of slave status transmitted from the master unit with control bits 0000 or
0110 is set to 0.
Data Sheet S13990EJ3V0DS
53